17. a. How many integers are there from 1000 through 9999? b. How many odd integers are there from 1000 through 9999? c. How many integers from 1000 through 9999 have dis- tinct digits? d. How many odd integers from 1000 through 9999 have distinct digits? e. What is the probability that a randomly chosen four- digit integer has distinct digits? has distinct digits and is odd?

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